"OWL Cybersecurity, the Denver technology firm that regularly scrapes the dark web for digital signs of malicious threats, saw the 200 million Yahoo credentials for sale 'on and off for several months' before Wednesday’s admission by Yahoo, said Mark Turnage, OWL’s CEO. 'This again clearly shows why it’s important to monitor the darknet for the presence of your data, as it often precedes even the awareness of a breach.”'